LXR linux/drivers/staging/rtl8192u/r8180

   1/*
   2   This files contains card eeprom (93c46 or 93c56) programming routines,
   3   memory is addressed by 16 bits words.
   4
   5   This is part of rtl8180 OpenSource driver.
   6   Copyright (C) Andrea Merello 2004  <andrea.merello@gmail.com>
   7   Released under the terms of GPL (General Public Licence)
   8
   9   Parts of this driver are based on the GPL part of the
  10   official realtek driver.
  11
  12   Parts of this driver are based on the rtl8180 driver skeleton
  13   from Patric Schenke & Andres Salomon.
  14
  15   Parts of this driver are based on the Intel Pro Wireless 2100 GPL driver.
  16
  17   We want to thank the Authors of those projects and the Ndiswrapper
  18   project Authors.
  19*/
  20
  21#include "r8180_93cx6.h"
  22
  23static void eprom_cs(struct net_device *dev, short bit)
  24{
  25        u8 cmdreg;
  26
  27        read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  28        if (bit)
  29                /* enable EPROM */
  30                write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_CS_BIT);
  31        else
  32                /* disable EPROM */
  33                write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_CS_BIT);
  34
  35        force_pci_posting(dev);
  36        udelay(EPROM_DELAY);
  37}
  38
  39
  40static void eprom_ck_cycle(struct net_device *dev)
  41{
  42        u8 cmdreg;
  43
  44        read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  45        write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_CK_BIT);
  46        force_pci_posting(dev);
  47        udelay(EPROM_DELAY);
  48
  49        read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  50        write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_CK_BIT);
  51        force_pci_posting(dev);
  52        udelay(EPROM_DELAY);
  53}
  54
  55
  56static void eprom_w(struct net_device *dev, short bit)
  57{
  58        u8 cmdreg;
  59
  60        read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  61        if (bit)
  62                write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_W_BIT);
  63        else
  64                write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_W_BIT);
  65
  66        force_pci_posting(dev);
  67        udelay(EPROM_DELAY);
  68}
  69
  70
  71static short eprom_r(struct net_device *dev)
  72{
  73        u8 bit;
  74
  75        read_nic_byte_E(dev, EPROM_CMD, &bit);
  76        udelay(EPROM_DELAY);
  77
  78        if (bit & EPROM_R_BIT)
  79                return 1;
  80
  81        return 0;
  82}
  83
  84
  85static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
  86{
  87        int i;
  88
  89        for (i = 0; i < len; i++) {
  90                eprom_w(dev, b[i]);
  91                eprom_ck_cycle(dev);
  92        }
  93}
  94
  95
  96u32 eprom_read(struct net_device *dev, u32 addr)
  97{
  98        struct r8192_priv *priv = ieee80211_priv(dev);
  99        short read_cmd[] = {1, 1, 0};
 100        short addr_str[8];
 101        int i;
 102        int addr_len;
 103        u32 ret;
 104
 105        ret = 0;
 106        /* enable EPROM programming */
 107        write_nic_byte_E(dev, EPROM_CMD,
 108                       (EPROM_CMD_PROGRAM<<EPROM_CMD_OPERATING_MODE_SHIFT));
 109        force_pci_posting(dev);
 110        udelay(EPROM_DELAY);
 111
 112        if (priv->epromtype == EPROM_93c56) {
 113                addr_str[7] = addr & 1;
 114                addr_str[6] = addr & (1<<1);
 115                addr_str[5] = addr & (1<<2);
 116                addr_str[4] = addr & (1<<3);
 117                addr_str[3] = addr & (1<<4);
 118                addr_str[2] = addr & (1<<5);
 119                addr_str[1] = addr & (1<<6);
 120                addr_str[0] = addr & (1<<7);
 121                addr_len = 8;
 122        } else {
 123                addr_str[5] = addr & 1;
 124                addr_str[4] = addr & (1<<1);
 125                addr_str[3] = addr & (1<<2);
 126                addr_str[2] = addr & (1<<3);
 127                addr_str[1] = addr & (1<<4);
 128                addr_str[0] = addr & (1<<5);
 129                addr_len = 6;
 130        }
 131        eprom_cs(dev, 1);
 132        eprom_ck_cycle(dev);
 133        eprom_send_bits_string(dev, read_cmd, 3);
 134        eprom_send_bits_string(dev, addr_str, addr_len);
 135
 136        /*
 137         * keep chip pin D to low state while reading.
 138         * I'm unsure if it is necessary, but anyway shouldn't hurt
 139         */
 140        eprom_w(dev, 0);
 141
 142        for (i = 0; i < 16; i++) {
 143                /* eeprom needs a clk cycle between writing opcode&adr
 144                 * and reading data. (eeprom outs a dummy 0)
 145                 */
 146                eprom_ck_cycle(dev);
 147                ret |= (eprom_r(dev)<<(15-i));
 148        }
 149
 150        eprom_cs(dev, 0);
 151        eprom_ck_cycle(dev);
 152
 153        /* disable EPROM programming */
 154        write_nic_byte_E(dev, EPROM_CMD,
 155                       (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
 156        return ret;
 157}
 158